Sound box



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SOUND BOX. APPLICATION man APR. 20. me.

Patented Jan. 3, 1922.

UNITED STATES PATENT orrlca.

ronrsr CHENEY, or cmcaqo, rumors, ASSIGN'OR TO,CHENEY mums Mann-meYCOMPANY, or crrrcaeo, ILLINOIS, a conroaa'rrou or rumors.

SOUND 330x.

To all whom it may concern:

Be it known that I, Fonnsr CHENEY, a citizen of the United States,residing at Chicago, in thecounty of Cook and State of Illinois, haveinvented certain new and useful Improvements in a Sound Box, of whichthe following is a specification.

My invention relates to sound boxes for disc record talking machines andparticu-' larly to a sound box casing having an enlar 'ed air chambertherein.

ne of the objects of my invention is to increase the air chamber spacewithin a sound box casing without increasing the size of the casing.

' Another object is to provide a means for mounting the diaphragm in thesound box whereby the air space behind the diaphragm is enlarged.

A further object is to provide means for retaining a diaphragm inposition in a sound box casing while increasing the volume within theair chamber-of the casing.

To accomplish the objects of my invention I provide a sound box whereinthe open interior portions are of substantially the same diameter fromfront to back with the provision of a shoulder'which projects into theair space: a comparatively short distance, in fact about of an inch. Theshoulder forms a diminished diameter within the rear portion of thecasing which diameter is diminished only of an inch therefore, so

that for all purposes of sound reproduction,

the diameter of the air chamber within the casing is substantial Theabove recited o from the drawings, Figure is side inve n igure A A ing aa Li V1 011 Specification of Letters Patent.

Application filed April 20,

@ Patented Jan. 3, 1922.

1918. Serial No. 229,697.

shoulder 7 at the periphery with the greater portion of the ringextending into the open interior of the casing 5, the width of the ring6 being no greater thannecessary to serve as a proper support for theinner diaphragm gasket 8. The ring is preferably made to oppose anytendency to be pushed out of engaging position with theshoulder 7 by thediaphragm when the latter is inserted in position.v

Having formed the casing 5 with the hollow interior {portion ofsubstantially the same diameter, the formation of which results in theshoulder 7, I may then mount the ring 6 on the shoulder 7 and then placeon the ring a gasket 8, the width of which gasket is not greater thanthe width of the ring 6. Preferably the portion of the gasket whichengages the diaphragm is semicircular in ection to afford substantialline contact with the diaphragm, which line of engagement between thediaphragm and the supporting gaskets and washers is inwardly of the lineof engagement between the ring 6 and tne shoulder 7. t may here be notedt diameter of the inner circle of the is less than the diameter of thesound the inner edge of the shoulder 7 *rat the diameter of the outercircle of the ring is but very slightly more than the diameter of thesound box at the inner edge of the shoulder. Then on the gasket 1 vcedthe diaphragm 9 and over the gm another gasket 10 similar in secthegasket 8. The gasket also prefiy has substantial line contact with thediap r Then over gasket 10 is placed 11 mounted in a shoulthe outerportion of the 13 fasten the retaining position. It will be oba means ofmounting am the diaphragm securely in on so as oe acted upon by theusual through suitable means is connected,

to the needle (not hown). It will be observed that the space within thecasing 5 behind the ring 6 is in diameter substantially equal to theouter portion of the interior of the casing. By providing a shoulder ofslight width and mounting the inner gasket 8 on a metallic ring, it ispossible to sider as coming within the spirit of my invention. J

I claim ,L Asound box mounting for a diaphragm including in combinationwith a hollow casingga diaphragm adapted to be connected at itsperiphery, a washer adapted to bear against the diaphragm-"at its rearside, said washer having a flat surface, a ring adaptedforengagementwitli the flat surface of the washer, the width of the ringbeing no greater than the width of said flat surface, said washeradapted to have a'bearing throughout the extent of said ring surface,

said ring engaging the shoulder of the sound box only at the peripheryof the ring, the surface engagement between the ring and the shoulderbeing les than the surface engagement between the washer and the ring,

the parts being so arranged that the diameter of the inner circle ofthering is less than the diameter of the sound box at the inner edge ofthe shoulder. 9

2. A sound box including a diaphragm, said sound box having an airchamber therein of substantially the same bore throughout its depth andprovided with a shoulder of slight width, a mounting for securing thediaphragm of said'sound box including a ring adapted to engage saidshoulder at the periphery of the ring only, the engagement 4 between thering and the shoulder being substantially less than half of the width ofthe ring, a washer having a fiat surface, which surface engages the ringand which washer supports the diaphragm thereon,

and means for fastening. the diaphragm in position on said washer.

Signed at Chicago, State of Illinois, this 17th day of April, A. D.,1918.

FOREST CHENEY.

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